Worksheet 17 · Skill 5

Set and drift

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1. At 0750 your fix is 021°T, 2.8 nm from Gannet Rock daybeacon. You steer 224°T at 6.1 kn through the water. At 0850 a new fix puts you 226°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0850 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1110 your fix is 220°T, 1.9 nm from Tern Island tower. You steer 233°T at 4.7 kn through the water. At 1145 a new fix puts you 043°T, 3.1 nm from Heron Point Light.

   Plot the 1145 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1535 your fix is 045°T, 4.5 nm from Westfield church spire. You steer 140°T at 7.5 kn through the water. At 1620 a new fix puts you 224°T, 1.9 nm from Tern Island tower.

   Plot the 1620 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1300 your fix is 308°T, 1.8 nm from Kittle water tank. You steer 022°T at 8.9 kn through the water. At 1345 a new fix puts you 061°T, 4.2 nm from Tern Island tower.

   Plot the 1345 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1120 your fix is 322°T, 1.4 nm from Kittle water tank. You steer 310°T at 7.3 kn through the water. At 1210 a new fix puts you 269°T, 3.3 nm from Tern Island tower.

   Plot the 1210 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1230 your fix is 021°T, 3.3 nm from Westfield church spire. You steer 120°T at 6.0 kn through the water. At 1310 a new fix puts you 278°T, 2.9 nm from Tern Island tower.

   Plot the 1310 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1000 your fix is 052°T, 2.1 nm from Heron Point Light. You steer 087°T at 6.2 kn through the water. At 1035 a new fix puts you 242°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1035 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1245 your fix is 319°T, 1.5 nm from Kittle water tank. You steer 300°T at 5.1 kn through the water. At 1410 a new fix puts you 025°T, 3.9 nm from Westfield church spire.

   Plot the 1410 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn